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If you lose the iPhone or it breaks you can connect the new one to your computer and load your old data. It creates a backup automatically of everything on the iPhone. So for example you can safely charge your iPhone with an iPad USB adapter.
You do not have to charge your new iPhone before using it but as has been stated by williemorris it is recommended that you charge the battery to capacity before using it.
In fact this view is misled by Ni-MH batteries in the past todays mobile phones generally use lithium batteries users. When you charge it overnight it likely gets to 100 percent and stays there for hourswhich can age your battery faster. The initial charge of a new iPhone is very important. With ion lithium batterys there is no need to commission the battery for first use.